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<title>css03-选择器</title>
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	<div class="red">这是div容器1</div>
	<div class="green">这是div容器2</div>
	<div id="blue">这是div容器3</div>
	<div id="yl">这是div容器4</div>
	<p>选择器的优先级：行内样式>id>class>标签样式</p>
	
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